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M in (-oo:+oo)
M/12 = 3/2 // - 3/2
M/12-(3/2) = 0
M/12-3/2 = 0
1/12*M-3/2 = 0 // + 3/2
1/12*M = 3/2 // : 1/12
M = 3/2/1/12
M = 18
M = 18
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